The size of an animal also affects which of the methods in the previous section it might use to detect the source of a sound. Temperature decreases with depth but pressure increases with the result th...The size of an animal also affects which of the methods in the previous section it might use to detect the source of a sound. Temperature decreases with depth but pressure increases with the result that there is a layer of the ocean at a depth of about \(0.7\text{ km}\) where the speed of sound is the slowest.